瑜伽論記 4.298

4.298

今但說所證空無相境，故與前別，即滅四行名無相行，道諦四行非三等持，何故無願無相說心三摩地空不說耶？

Now it only speaks of the signless objective sphere of realized emptiness, and therefore it differs from the previous. Namely, the four aspects of cessation are called the signless practice; the four aspects of the truth of the path do not belong to the three samādhis. Why is it that wishlessness and the signless speak of the mental samādhi, whereas emptiness does not?